Joni Ernst might be great for determination, fire, demographics, for photo ops, for veteran affairs, etc., but there is absolutely no guarantee that a republican would win her seat in Iowa. Of all the potential veeps, she is the worst choice...not because of anything about her...but because of the uncertainty of winning her seat in Iowa.
I don’t think she’s even really a consideration. IMHO
That, and since being elected to Congress, she hasn’t done a damned thing.